Peach tree window screen pin

A quick learner from Oswego, NY says:
I have double hung peach tree windows from the early 1990s. I am looking for the pin that attaches the scream to the top of the window on the outside of the house. This piece is 1/8 inch in diameter, is silver, and is hollow in the center. it does not appear to be the spring mountain piece that I have seen on the Swisco site. Can you identify the part I need?
Thanks
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Tom from SWISCO responded:

This looks like a plunger pin at first glance, like our 70-008 or 70-009. Could these be what you need? If not, I'll need you to remove a version of this part that is whole and undamaged so that we can get a better look at it. 

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